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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9037fd4dc6228592cc9bb7f3a934e0f2ab739fbfac09ce660f58a35d7e751092' 
  AND token = 'P52QYUnOcaA1ixJs7moj7vxTR5WJSiViMCae0FrcqiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}